Numerical investigation into the stability of single-layer glulam reticulated domes with end-bearing bolt-connected joints

This study presents a numerical investigation into the stability of single-layer glulam reticulated domes with end-bearing bolted connection (EBBC) joints. A comprehensive nonlinear finite element model incorporating material anisotropy, joint semi-rigidity, and roof-structure interaction was established for parametric analysis. The analysis reveals that joint plasticity develops prior to member yielding; however, ultimate failure is governed by member buckling. For the EBBC joint configurations considered herein, the semi-rigidity reduces the global stiffness by 17% and the ultimate capacity by 25% for a typical 65 m span Kiewitt dome. Structural sensitivity to geometric imperfections increases nonlinearly once the initial deflection exceeds a certain threshold. Axial compression generally enhances joint rotational capacity, with mean improvement factors of 1.54 under full-span loading and 1.33 under half-span loading. Roof panel constraints effectively suppress lateral buckling through progressive nail yielding, maintaining lateral restraint even after member deformation. The findings provide valuable insights into the progressive failure mechanisms and coupling effects in EBBC joints, thereby establishing a basis for optimising the design of glulam reticulated domes.